@@ -1556,6 +1556,11 @@ TODO
* 【《双因素认证(2FA)教程》】(http://www.ruanyifeng.com/blog/2017/11/2fa-tutorial.html)
### 单点登录(SSO)
* [《单点登录原理与简单实现》](https://www.cnblogs.com/ywlaker/p/6113927.html)
* [CAS单点登录框架](https://github.com/apereo/cas)
# 常用开源框架
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